this was posted by caboobaroo, in this thread, http://www.ultimatesubaru.org/forum/topic/47998-5-lug-conversion-list-plus-tips/
ive messaged him but havent heard back yet.
3. If you plan on running an Impreza coilover setup, it'll bolt into the front with the strut tower mod listed in #2 but the rear is totally different EA82 vs. Impreza. The rear will fit nonetheless BUT you HAVE to use the original EA82 tophats in the rear. I have yet to do this portion of the conversion and I have only read that it would work so I have not yet found out myself if it does or not.